Drilling-machine.



M. W. SHERWOOD.

DRILLING` MAGHINE.

APPLIoATxoN FILED rum, 1914.

Patented Nov. 3, 1914.

3 SHEETS-SHEET 1.

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M. W. SHERWODD.

DRILLING MACHINE.

APPLIOA'NON FILED Hmz, 1914.

Patented Nov. 3,1914.

3 SHBETB*SHEBT 2.

LHJSQ@ fnac/'Mr M. W. SHERWOOD. DRILLING MACHINE.

APPLIOATlOlI FILED FEB.2, 1914. 1.11 6,139. y I Patented Nov. 3, 1914.

3 SHEETS-SHEET 3.

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@UNTTED sTATns PATENT onirica.

MATHER W. SHERWOOD, OF FRANKLIN, PENNSYLVANIA, .ASSIGNOE TO CHICAGO PNEUMATIC TOOL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

IDRILLING-MACHINE.

Patented Nov. 3., 1914.

To all whom t may concern.'

Be it known that I, MATHnn W. SHER- wooD, a citizen of the United States, re-

siding at Franklin, in the countyof Yenango `and State of Pennsylvania, have invented certain new and useful Improvements in Drilling-Machines, of which the following is a specification.

My invention relates to a motive fluid operated drilling `machine of that type employing a fluid operated motor mounted on the machine for rotating the drill bit or steel during the time of operation of the drilling engine. `The object of my invention is to provide 'a simple, efficient and reliable machine of this type possessing many advantages in construction and mode of operation and results over the drilling machines heretofore in use.

Heretofore it has been proposed to drive the rotation motor by the exhaust of the drilling engine, that is to say, the motor has been driven by the motive Huid which has operated and passed through the engine and which has then been admitted to the motor for the purpose of operating it and consequently rotated the drill bit. There are several objections to such construction among which may be mentioned first the fact that the action of` the engine is interfered with by back pressure inasmuch as the exhaust flows to the rotation motor in-V stead of directly to the atmosphere, with the result that in order to accomplish any successful result the drillingengine would necessarily require larger sized parts and ports of large carrying capacity, and second the fact that the necessarily low pressure of exhaust as compared with the high pressure of the live motive fluid would require a large sized rotation motor in order to approximate any successful result.

It has also been proposed to drive the rotation motor by live motive' fluid supplied directly and independently of the motive fluid supplied to the drilling engine but this construction is also open to several objections, among which may be mentioned first the waste of motive fluid by the rotation motor especially when it is of the rotary type and second the absence of any automatic controlling feature with the result that constant and accurate manipulation of a controlling valve to the motor would be required in order to vary the speed betweeny racing when the drill bit ran free and to hslow down when the bit is stalling or in.- clined to stick.

A drilling machine embodying my invention overcomes the above-mentioned objec-l t1ons.`

One of the main features of my invention is the driving of the rotation motor directly by the live fluid and the driving of the drill ing engine by the exhaust from the motor, that is to say the motor is driven by the live fluid and the exhaust of the motor is delivered to the drilling engine for operating the latter which itself exhausts directly to the atmosphere. l

There are many practical advantages in favor of my construction including the following: First-,the power required to operate the rotation motor is only about five per cent. and the motive fluid passes through the motor in a dense state with the result that comparatively small-sized parts are permis sible. Second, any leakage through the motor is entirely immaterial, the rotation being still sufficiently powerful and the motive fluid not being wasted because it flows from the motor to the engine for operating the latter. Third, the motor is automatically and perfectly regulated by reason of the fact that the flow of motive fluid through the motor is governed by the consumption of the motive fluid by the engine, which consumption is practlcally constant. Fourth, there. is automatically increased power of the rotation and decreased power of the drilling engine when the bit stalls or begins to stick, both of which effects are desirable in such event. Fifth, there are also advantageous features of mechanical constructionsuch as the use of two gears or worms operating on opposite sides of the gear of the sleeve holding the bit, represeating a balanced construction.

In the drawings Figure 1 is a central longitudinal sectional elevation of a drill embodying my invention; Fig. 2 is a similar section taken on the line 1-1 of Fig. 2; Fig. 3 a cross section on the line 3--3 of Fig. 2 but on a larger scale; Fig. 4 an elevation of the throttle valve plug; Fig. 5 a cross section on the line 5 5 of Il; Fig. a sectional elevation on the line 6-6 of Fig. 2 and Fig. 7 a sectional elevation on the line 7 7 of Fig. 3.

My invention may be embodied in mait may be embodied in any percussive machine requiring a rotary movement of the tool.

The particular construction andembodiment herein illustrated has been selected for the purpose of giving a clear and accuy 'rate description of m invention and I will now proceed to describe the same with that understanding.

As herein shown the drilling machine comprises essentially the drilling engine and the fluid pressure operative mechanism for rotating the drill bit or steel. The ma-I chine comprises three main parts, to wit, the

body or main cylinder 1, a back head2 and a front head S'between which and the cylinder is interposed a bushing 4. rThe back head is secured to the cylinder in suitable manner as by means of short bolts 5. The front head 1s secured to the front end of l the cylinder in suitable manner as by means of the bolts 6 provided with the usual cushioning springs 7.

The cylinder 1 is rovided with the piston chamber 8 within w ich reciprocates a ham mer piston 9 adapted to deliver'its blows upon the shank of a striking piece or anvil 10 which in turn transmits or delivers the blows to the inner end of theusualv drill bit or steel 11. l

The front head 3 provides a bearing for a rotatable drill sleeve 12 whose inner env larged end is formed asI a worm gear 13. The front face of this gear bears against a shoulder 3 in the interior of the front head and the rearward `face of such gear is provided with a marginal flange extension 13 which slips over a similar but forwardlyextending flange 4ft at the front end of the bushing 4.

The front head is extended laterally and provided thereat with two circular partially overlapping chambers 14 within which are mounted to rotate two similar rotors 15. These rotors are in the form of toothed wheels whose teeth mesh and which are adapted to be rotated by motivefluid intro duced into said chambers at fpoint adjacent their intermeshing sides. These rotors are secured to shafts 16 arranged parallel to each other and journaled in suitable parallel bearing openings in the front head as shown in Fig. 3. These shafts are provided intermediate their length with worm portions 17 meshing with the worm gear 13 at oppoy site sides 'thereof thereby balancing the structure and the strain on opposite sides of such worm gear.

The chambers 14 are provided with a motive fluid supply port and passage 18 entering the same at the lower side of such charnbers at a Aoint adjacent the intermeshing y portionsoithe rotors.l These chambers are provided at their 'top with an exhaust port and passage 19 for exhausting the "motive fluid afterit has passed upwardlythrough the chambers' and has rotated the rotors in its passage.

So .far as my invention in its broader aspect is concerned it would be sufficient to merely connect the. port 18 with any suitable source of motive fluid governed by any suitable throttle valve and admittin or shutting 0E the motive fluid through t e port 18. However, in order to increase the practical efficiency of this machine I prefer` to provide it with a hand throttle of the construction illustrated in Figs. 2, 4 and 5. This throttle valve comprises a tapered plug 2O fitting in a correspondingly tapered valve chamber forming a seat therelor in a casing21. The upper end of the valve is provided with a handle 22 and the lower end of the chamber has screw-threaded thereinto a coupling nut 23 into which is screwed the coupling of a supply hose or the like communicating with a source of motive Huid. rllhis valve plug is hollow and provided near its lower end with a side port 2O*L and at its upper end with a side port 2Gb, both of which communicate with the interiorof the plug.' The port 2()a is adapted to register with the port and pas sage 18 and the port 20b with the port and passage 19. `When the valve is in a position in which the port 20 registers with the port 18 the other port 2()b is out of register with its port 19. 1t will be understood that by these means and in this manner the motive :duid may be caused to pass through the chambers 14 and to thereby rotate the rotors or such motive fluid may be by-passed around such rotors by being admitted to the chambers 14 through the port 19.

The port 19 communicates with the outlet or exhaust port 24 whic-h in turn communi- Cates through a. hollow dowel pin 25 with a longitudinal supply passage 26 in the cylinder 1. rlhis latter passage communicates at its upper end with a transverse enlarged passage or chamber 27 in the back head. @ne end of this chamber isl closed by a screw plug' 28 and the other end is provided with a throttleggaflve 29 having a passage 30 communicating at all times with the chamber 27 and adapted in one position of such valve to communicate with a port 31 leading to the l valve chamber,

rlhe valve chamber which is formed at the -rearward end of the cylinder 1 may be of any desired construction and operation for controlling the admission of the motive fluid to and from opposite ends of the piston chamber 8. ln the prescntinstance this distributing valve is of the ball type comprising a ball 32 adapted to seat upon one or the other seats 33. and in order to control the ilav . the piston forwardly.

two ports 35 and 36 respectively. These seats form a part of a valve cage, the remaining'part being a shell 37 interposed between such seats and provided with inlet ports 38. The valve cage is contained within a valve chamber 39 and the parts of such cage are held together andin the forward end of the chamber by means of the spring 40 bearing at its forward end against the valve seat 34 and at its rear end against the screw plug 41 closing that end of the valve chamber. The annular space between the inner wall of the valve chamber and the shell 37 communicates with the supply port 31 through the two large supply ports 42, Fig. 6, and the rearward end of the valve chamber communicates with the adjacent end of the piston chamber 8 .by the `port 43.

The port 35 communicates with the longitudinal ypassage 44 in the cylinder 1 which,

in turn communicates with the front end of the piston chamber 8 through the cross port 45.

The drilling machine being constructed as above explained operates as follows: Assuming that the throttle valve 20 is turnedto the position shown in Fig. 2 and motive Huid is supplied through the coupling 23. Such Huid enters the rotor chambers 14 through the port 18 and causes these rotors to rotate in opposite directions. As a result of the rotation oi' these rotors the worms 17 are rotated and inasmuch as they both mesh with the worm gear 13 and on opposite sides thereof, such gear is thereby rotated, causing a rotation of the drill sleeve 12. It will be understood that this sleeve has a central angular opening of a size and shape to receive the drill bit so that such bit will be rotated by the rotations of the sleeve.-

The exhaust from the rotor chambers passes through the ports and passages 24, 26, 27, 30, 31 and 42 to the valve chamber. Assuming that the piston 9 is on its forward stroke and has delivered its blow to the anvil 10, the rear end of the piston chamber will be quickly exhausted after the piston has passed by the rearward one of the two eX- haust grooves 46 whereupon the live air in the front part of the valve chamber surrounding the seat will act upon the ball valve 32 and force it from its seat 33 and upon its other seat. The live motive fluid will now pass to the front e'nd of the piston chamber to return the piston to its rear- 'moved to its position illustrated' in Fig. 2

and the live air will be admitted to the rearward end of the piston chamber' 8 to drive Thus the drilling engine is operated by the exhaust from the rotors with the several advantageous and practical results set forth in the preamble.

YIf it is desired to operate the .drilling enthe rotors and'will be admitteddirectto the` drilling engine.

The back head is provided witha transverse oil supply chamber 47 into whose ends screws the two handles 48 thereby closing the ends of such chamber. This chamber is provided with a filling opening 49 closed by4 a screw plug 50. The bottom of this oil or lubricating chamber is provided with asmall opening 51 for the passage of the oil from such chamber into the path of the motive fluid passing to the distributing valve and theoperating parts of the engine.` The oil is carried by the motive Huid through the drilling engine for the purpose of lubricatingthe mov ing parts and whatever oil passes through the passage 44 and does not entei` the front end of the piston chamber 8 continues downwardly through the small passage52 extending through thelower end ot' the cylinder, the bushing Vand front head. The lower v interior of the front head 3 at a point adjacent the worm gear, therebyy lubricating the latter together with the worms-and the bearings of the two shafts 16. i

By the use of my invention4 I am'enabled to overcome the 'objectionsand to attain the various advantages in construction, operation and results as. set forthyin the preamble. .i Y

By preference the bushing and thc gear portion of the drillin sleeve have the slip joint connection herein efore described in order to prevent the entrance by any possibility of any chips or the like from passing from the space adjacent the anvil and inner end of the drill bit to the gearing, thereby preserving the latter from injury and wear.

I claim: l. In a drilling machine, the combination, with the drilling engine, of means for effecting the rotation of the drilling tool including a fluid pressure actuated motor operatively connected with the tool, the exhaust of the motor communicating with the inlet .of the engine for operating the latter.

ing the rota-tion of the drilling tool including a 'fluid pressure actuated motor oper'- atively connected with the tool, said motor being of the rotary type, and means for supplying live motive fluid direct to the motor, the exhaust of such motor communicating with the inlet of the engine for operating the latter. n

4L. In a drilling machine, the combination, with the drilling engine, of means for effecting the rotation of the drilling tool including a fluid pressure actuated motor operatively connected With the tool, means of communication between the exhaust of the motor and the inlet of the engine for operating the latter, such motor having a casing provided with an inlet, and a valve in said casing for supplying live motive fluid either direct to the engine through said communication, or indirect thereto through the motor and through said communication.

ln a drilling machine, the combination, with 'the drilling engine, of means for effecting the rotation of the drilling tool ineluding a lluid pressure actuated motor operatively connected With the tool, said motor including a casing and ltwov intermeshing toothed rotors therein, vsuch casing having a live motive fluid inletport in position to admit the iuid to the intermeshing portions of the rotors and having an exhaust port communicating lwith the engine for supplying the exhaust o'l1 the motor thereto for driving the engine.

G.. in a drilling machine, the combination, with the drilling engine, of means for-effecting the rotation of the drilling tool comprising a sleeve adapted to receive the tool and mounted to rotate on the front end of the engine, a gear Wheel on said sleeve, driving gears meshing with said gear on opposite sides thereof and acting simultaneously thereon, and a l'luid pressure actuated motor mounted on the engine and operatively con nected with said driving gears.'

7. ln a drilling machine, the combination1 ruegen With the drilling engine, of means Jfor edecting the rotation of the drilling tool comof the drilling engine including a cylinder,l

a front head, a. drilling sleeve hearing therein and having at one end a gear portion, a bushing interposed between the cylinder and front head, said bushing and gear portion having a slip joint connection, and means for rotating the sleeve.

9. ln a drilling machine, the combination,

of the drilling engine including a cylinder,'

a front head, a drilling sleeve bearing therein and having at one end a gear portion, a bushing interposed between the cylinder and front head, said bushing and gear portion havingrprojecting overlapping flanges, and means for rotating the sleeve.

10. ln a drilling machine, the combinatien, ofv the drilling engine including a cylinder, a front head, a drilling sleeve bearing therein and having at one end a gear portion, a back head on the cylinder provided with a motive fluid passage for conducting the fluid to the engine, and having an oil supply communicating with such passage, a distributing valve communicating With said passage and With passages entering opposite ends ofthe cylinder, said cylinder and front head having an oil passage leading from the lower end of the passage to the front end of the cylinder and passing through the front head to said gear portion.

MATHER W. SHERWOOD.

Wlitnesses:

S. E. HIBBEN, Romina; DOBBERMAN. 

